Replace valid memory checks with new myfault class "exception handling", almost

everywhere.  Leave some thread.cc stuff alone for now.
* cygtls.h: Kludge some definitions to avoid including a problematic windows
header.
(_cygtls::_myfault): New entry.
(_cygtls::_myfault_errno): Ditto.
(_cygtls::fault_guarded): New function.
(_cygtls::setup_fault): Ditto.
(_cygtls::return_from_fault): Ditto.
(_cygtls::clear_fault): Ditto.
(myfault): New class.
* exceptions.cc (handle_exceptions): Handle case of guarded fault in system
routine.
* gendef: Add another entry point for setjmp that the compiler doesn't know
about and won't complain about.
* gentls_offsets: Just include windows.h rather than kludging a HANDLE def.
* miscfuncs.cc (check_null_str): Delete.
(check_null_empty_str): Ditto.
(check_null_empty_str_errno): Ditto.
(check_null_str_errno): Ditto.
(__check_null_invalid_struct): Ditto.
(__check_null_invalid_struct_errno): Ditto.
(__check_invalid_read_ptr): Ditto.
(__check_invalid_read_ptr_errno): Ditto.
(dummytest): New function.
(check_iovec_for_read): Delete.
(chec_iovec): Rename from check_iovec_for_write.  Take a read/write parameter.
* tlsoffsets.h: Regenerate.
* winsup.h: Remove check_* declarations.
(check_iovec_for_read): Delete declaration.  Turn into a define instead.
(check_iovec_for_write): Ditto.
(check_iovec): New declaration.
* thread.h: Use ifdef guard name consistent with other header files.

32 files changed, 514 insertions, 446 deletions

diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog
index 2525c9e6b..0dfa37987 100644
--- a/winsup/cygwin/ChangeLog
+++ b/winsup/cygwin/ChangeLog
@@ -1,5 +1,46 @@
 2005-07-02  Christopher Faylor  <cgf@timesys.com>
 
+	Replace valid memory checks with new myfault class "exception
+	handling", almost everywhere.  Leave some thread.cc stuff alone for
+	now.
+	* cygtls.h: Kludge some definitions to avoid including a problematic
+	windows header.
+	(_cygtls::_myfault): New entry.
+	(_cygtls::_myfault_errno): Ditto.
+	(_cygtls::fault_guarded): New function.
+	(_cygtls::setup_fault): Ditto.
+	(_cygtls::return_from_fault): Ditto.
+	(_cygtls::clear_fault): Ditto.
+	(myfault): New class.
+	* exceptions.cc (handle_exceptions): Handle case of guarded fault in
+	system routine.
+	* gendef: Add another entry point for setjmp that the compiler doesn't
+	know about and won't complain about.
+	* gentls_offsets: Just include windows.h rather than kludging a HANDLE
+	def.
+	* miscfuncs.cc (check_null_str): Delete.
+	(check_null_empty_str): Ditto.
+	(check_null_empty_str_errno): Ditto.
+	(check_null_str_errno): Ditto.
+	(__check_null_invalid_struct): Ditto.
+	(__check_null_invalid_struct_errno): Ditto.
+	(__check_invalid_read_ptr): Ditto.
+	(__check_invalid_read_ptr_errno): Ditto.
+	(dummytest): New function.
+	(check_iovec_for_read): Delete.
+	(chec_iovec): Rename from check_iovec_for_write.  Take a read/write
+	parameter.
+	* tlsoffsets.h: Regenerate.
+	* winsup.h: Remove check_* declarations.
+	(check_iovec_for_read): Delete declaration.  Turn into a define
+	instead.
+	(check_iovec_for_write): Ditto.
+	(check_iovec): New declaration.
+
+	* thread.h: Use ifdef guard name consistent with other header files.
+
+2005-07-02  Christopher Faylor  <cgf@timesys.com>
+
 	* include/cygwin/version.h: Bump DLL minor number to 19.
 
 2005-06-30  Corinna Vinschen  <corinna@vinschen.de>
diff --git a/winsup/cygwin/cygtls.cc b/winsup/cygwin/cygtls.cc
index 58e82d2ec..0e29d8901 100644
--- a/winsup/cygwin/cygtls.cc
+++ b/winsup/cygwin/cygtls.cc
@@ -7,6 +7,9 @@ Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
 details. */
 
 #include "winsup.h"
+#include <sys/time.h>
+#define USE_SYS_TYPES_FD_SET
+#include <winsock.h>
 #include "thread.h"
 #include "cygtls.h"
 #include "assert.h"
diff --git a/winsup/cygwin/cygtls.h b/winsup/cygwin/cygtls.h
index 7ee1ddcc1..2ac6d04b3 100644
--- a/winsup/cygwin/cygtls.h
+++ b/winsup/cygwin/cygtls.h
@@ -16,8 +16,34 @@ details. */
 #define _NOMNTENT_FUNCS
 #include <mntent.h>
 #undef _NOMNTENT_FUNCS
-#define USE_SYS_TYPES_FD_SET
-#include <winsock.h>
+#include <setjmp.h>
+
+#ifndef _WINSOCK_H
+/* Stupid hack: Including winsock.h explicitly causes too many problems. */
+struct sockaddr_in
+{
+  short   sin_family;
+  u_short sin_port;
+  struct in_addr
+  {
+    union
+    {
+      struct
+      {
+	u_char s_b1, s_b2, s_b3, s_b4;
+      } S_un_b;
+      struct
+      {
+	u_short s_w1, s_w2;
+      } S_un_w;
+      u_long S_addr;
+    } S_un;
+  };
+  struct  in_addr sin_addr;
+  char    sin_zero[8];
+};
+typedef unsigned int SOCKET;
+#endif
 
 #define CYGTLS_INITIALIZED 0x43227
 #define CYGTLS_EXCEPTION (0x43227 + true)
@@ -118,6 +144,12 @@ typedef struct struct_waitq
    of the compiler used to generate tlsoffsets.h and the cygwin cross compiler.
 */
 
+/*gentls_offsets*/
+#include "cygerrno.h"
+
+extern "C" int __sjfault (jmp_buf);
+/*gentls_offsets*/
+
 typedef __uint32_t __stack_t;
 struct _cygtls
 {
@@ -142,6 +174,8 @@ struct _cygtls
     };
   struct _local_storage locals;
   class cygthread *_ctinfo;
+  void *_myfault;
+  int _myfault_errno;
   waitq wq;
   struct _cygtls *prev, *next;
   __stack_t *stackptr;
@@ -172,7 +206,9 @@ struct _cygtls
 				  struct sigaction& siga)
     __attribute__((regparm(3)));
   void init_threadlist_exceptions (struct _exception_list *);
+#ifdef _THREAD_H
   operator HANDLE () const {return tid->win32_obj_id;}
+#endif
   void set_siginfo (struct sigpacket *) __attribute__ ((regparm (3)));
   void set_threadkill () {threadkill = true;}
   void reset_threadkill () {threadkill = false;}
@@ -182,6 +218,26 @@ struct _cygtls
   void lock () __attribute__ ((regparm (1)));
   void unlock () __attribute__ ((regparm (1)));
   bool locked () __attribute__ ((regparm (1)));
+  void*& fault_guarded () {return _myfault;}
+  void return_from_fault ()
+  {
+    if (_myfault_errno)
+      set_errno (_myfault_errno);
+    longjmp ((int *) _myfault, 1);
+  }
+  int setup_fault (jmp_buf j, int myerrno) __attribute__ ((always_inline))
+  {
+    if (_myfault)
+      return 0;
+    _myfault = (void *) j;
+    _myfault_errno = myerrno;
+    return __sjfault (j);
+  }
+  void clear_fault (jmp_buf j) __attribute__ ((always_inline))
+  {
+    if (j == _myfault)
+      _myfault = NULL;
+  }
   /*gentls_offsets*/
 };
 #pragma pack(pop)
@@ -191,6 +247,22 @@ extern char *_tlstop __asm__ ("%fs:8");
 #define _my_tls (((_cygtls *) _tlsbase)[-1])
 extern _cygtls *_main_tls;
 
+/*gentls_offsets*/
+class myfault
+{
+  jmp_buf buf;
+public:
+  ~myfault () __attribute__ ((always_inline))
+    {
+      _my_tls.clear_fault (buf);
+    }
+  inline int faulted (int myerrno = 0) __attribute__ ((always_inline))
+  {
+    return _my_tls.setup_fault (buf, myerrno);
+  }
+};
+/*gentls_offsets*/
+
 #define __getreent() (&_my_tls.local_clib)
 
 const int CYGTLS_PADSIZE  = (((char *) _main_tls->padding) - ((char *) _main_tls));
diff --git a/winsup/cygwin/dir.cc b/winsup/cygwin/dir.cc
index c6a6bc6e6..254906a6e 100644
--- a/winsup/cygwin/dir.cc
+++ b/winsup/cygwin/dir.cc
@@ -23,11 +23,13 @@ details. */
 #include "fhandler.h"
 #include "dtable.h"
 #include "cygheap.h"
+#include "cygtls.h"
 
 extern "C" int
 dirfd (DIR *dir)
 {
-  if (check_null_invalid_struct_errno (dir))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return -1;
   if (dir->__d_cookie != __DIRENT_COOKIE)
     {
@@ -67,7 +69,8 @@ opendir (const char *name)
 extern "C" struct dirent *
 readdir (DIR *dir)
 {
-  if (check_null_invalid_struct_errno (dir))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return NULL;
 
   if (dir->__d_cookie != __DIRENT_COOKIE)
@@ -141,7 +144,8 @@ readdir (DIR *dir)
 extern "C" _off64_t
 telldir64 (DIR *dir)
 {
-  if (check_null_invalid_struct_errno (dir))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return -1;
 
   if (dir->__d_cookie != __DIRENT_COOKIE)
@@ -159,7 +163,8 @@ telldir (DIR *dir)
 extern "C" void
 seekdir64 (DIR *dir, _off64_t loc)
 {
-  if (check_null_invalid_struct_errno (dir))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return;
 
   if (dir->__d_cookie != __DIRENT_COOKIE)
@@ -179,7 +184,8 @@ seekdir (DIR *dir, _off_t loc)
 extern "C" void
 rewinddir (DIR *dir)
 {
-  if (check_null_invalid_struct_errno (dir))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return;
 
   if (dir->__d_cookie != __DIRENT_COOKIE)
@@ -192,7 +198,8 @@ rewinddir (DIR *dir)
 extern "C" int
 closedir (DIR *dir)
 {
-  if (check_null_invalid_struct_errno (dir))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return -1;
 
   if (dir->__d_cookie != __DIRENT_COOKIE)
diff --git a/winsup/cygwin/environ.cc b/winsup/cygwin/environ.cc
index ddd038285..099dcaee5 100644
--- a/winsup/cygwin/environ.cc
+++ b/winsup/cygwin/environ.cc
@@ -331,20 +331,18 @@ _addenv (const char *name, const char *value, int overwrite)
 extern "C" int
 putenv (char *str)
 {
-  int res;
-  if ((res = check_null_empty_str (str)))
+  myfault efault;
+  if (efault.faulted (EFAULT))
+    return -1;
+  if (*str)
     {
-      if (res == ENOENT)
-	return 0;
-      set_errno (res);
-      return  -1;
-    }
-  char *eq = strchr (str, '=');
-  if (eq)
-    return _addenv (str, eq + 1, -1);
+      char *eq = strchr (str, '=');
+      if (eq)
+	return _addenv (str, eq + 1, -1);
 
-  /* Remove str from the environment. */
-  unsetenv (str);
+      /* Remove str from the environment. */
+      unsetenv (str);
+    }
   return 0;
 }
 
@@ -353,19 +351,11 @@ putenv (char *str)
 extern "C" int
 setenv (const char *name, const char *value, int overwrite)
 {
-  int res;
-  if ((res = check_null_empty_str (value)) == EFAULT)
-    {
-      set_errno (res);
-      return  -1;
-    }
-  if ((res = check_null_empty_str (name)))
-    {
-      if (res == ENOENT)
-	return 0;
-      set_errno (res);
-      return  -1;
-    }
+  myfault efault;
+  if (efault.faulted (EFAULT))
+    return -1;
+  if (!*name)
+    return 0;
   if (*value == '=')
     value++;
   return _addenv (name, value, !!overwrite);
diff --git a/winsup/cygwin/exceptions.cc b/winsup/cygwin/exceptions.cc
index 0e7a09fdf..d375c0a07 100644
--- a/winsup/cygwin/exceptions.cc
+++ b/winsup/cygwin/exceptions.cc
@@ -403,6 +403,7 @@ handle_exceptions (EXCEPTION_RECORD *e0, void *frame, CONTEXT *in0, void *)
 {
   static bool NO_COPY debugging;
   static int NO_COPY recursed;
+  _cygtls& me = _my_tls;
 
   if (debugging && ++debugging < 500000)
     {
@@ -520,11 +521,12 @@ handle_exceptions (EXCEPTION_RECORD *e0, void *frame, CONTEXT *in0, void *)
 	break;
       }
 
-  if (!cygwin_finished_initializing
-      || GetCurrentThreadId () == sigtid
-      || (void *) global_sigs[si.si_signo].sa_handler == (void *) SIG_DFL
-      || (void *) global_sigs[si.si_signo].sa_handler == (void *) SIG_IGN
-      || (void *) global_sigs[si.si_signo].sa_handler == (void *) SIG_ERR)
+  if (!me.fault_guarded ()
+      && (!cygwin_finished_initializing
+	  || GetCurrentThreadId () == sigtid
+	  || (void *) global_sigs[si.si_signo].sa_handler == (void *) SIG_DFL
+	  || (void *) global_sigs[si.si_signo].sa_handler == (void *) SIG_IGN
+	  || (void *) global_sigs[si.si_signo].sa_handler == (void *) SIG_ERR))
     {
       /* Print the exception to the console */
       if (!myself->cygstarted)
@@ -559,11 +561,14 @@ handle_exceptions (EXCEPTION_RECORD *e0, void *frame, CONTEXT *in0, void *)
   RtlUnwind (frame, ret_here, e0, 0);
   __asm__ volatile (".equ _ret_here,.");
 
+  if (me.fault_guarded ())
+    me.return_from_fault ();
+
   si.si_addr = ebp;
   si.si_code = SI_KERNEL;
   si.si_errno = si.si_pid = si.si_uid = 0;
-  _my_tls.push ((__stack_t) ebp, true);
-  sig_send (NULL, si, &_my_tls);	// Signal myself
+  me.push ((__stack_t) ebp, true);
+  sig_send (NULL, si, &me);	// Signal myself
   return 1;
 }
 
diff --git a/winsup/cygwin/external.cc b/winsup/cygwin/external.cc
index 2bcbc7047..c731217ab 100644
--- a/winsup/cygwin/external.cc
+++ b/winsup/cygwin/external.cc
@@ -199,7 +199,8 @@ cygwin_internal (cygwin_getinfo_types t, ...)
       case CW_SET_CYGWIN_REGISTRY_NAME:
 	{
 	  const char *cr = va_arg (arg, char *);
-	  if (check_null_empty_str_errno (cr))
+	  myfault efault;
+	  if (efault.faulted (EFAULT) || !*cr)
 	    return (DWORD) NULL;
 	  cygheap->cygwin_regname = (char *) crealloc (cygheap->cygwin_regname,
 						       strlen (cr) + 1);
diff --git a/winsup/cygwin/fhandler_socket.cc b/winsup/cygwin/fhandler_socket.cc
index ced45039e..ffe647cb4 100644
--- a/winsup/cygwin/fhandler_socket.cc
+++ b/winsup/cygwin/fhandler_socket.cc
@@ -35,6 +35,7 @@
 #include "wininfo.h"
 #include <unistd.h>
 #include <sys/acl.h>
+#include "cygtls.h"
 
 #define ASYNC_MASK (FD_READ|FD_WRITE|FD_OOB|FD_ACCEPT|FD_CONNECT)
 
@@ -1659,11 +1660,14 @@ fhandler_socket::getpeereid (pid_t *pid, __uid32_t *euid, __gid32_t *egid)
       return -1;
     }
 
-  if (!check_null_invalid_struct (pid))
+  myfault efault;
+  if (efault.faulted (EFAULT))
+    return -1;
+  if (pid)
     *pid = sec_peer_pid;
-  if (!check_null_invalid_struct (euid))
+  if (euid)
     *euid = sec_peer_uid;
-  if (!check_null_invalid_struct (egid))
+  if (egid)
     *egid = sec_peer_gid;
   return 0;
 }
diff --git a/winsup/cygwin/fhandler_tape.cc b/winsup/cygwin/fhandler_tape.cc
index 1c7f5aa9e..2b1d458b2 100644
--- a/winsup/cygwin/fhandler_tape.cc
+++ b/winsup/cygwin/fhandler_tape.cc
@@ -10,6 +10,7 @@ Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
 details. */
 
 #include "winsup.h"
+#include "cygtls.h"
 #include <sys/termios.h>
 #include <unistd.h>
 #include <stdlib.h>
@@ -967,10 +968,11 @@ mtinfo_drive::set_options (HANDLE mt, long options)
 int
 mtinfo_drive::ioctl (HANDLE mt, unsigned int cmd, void *buf)
 {
+  myfault efault;
+  if (efault.faulted ())
+    return ERROR_NOACCESS;
   if (cmd == MTIOCTOP)
     {
-      if (__check_invalid_read_ptr (buf, sizeof (struct mtop)))
-	return ERROR_NOACCESS;
       struct mtop *op = (struct mtop *) buf;
       if (lasterr == ERROR_BUS_RESET)
 	{
@@ -1115,18 +1117,9 @@ mtinfo_drive::ioctl (HANDLE mt, unsigned int cmd, void *buf)
 	}
     }
   else if (cmd == MTIOCGET)
-    {
-      if (__check_null_invalid_struct (buf, sizeof (struct mtget)))
-	return ERROR_NOACCESS;
-      get_status (mt, (struct mtget *) buf);
-    }
-  else if (cmd == MTIOCPOS)
-    {
-      if (__check_null_invalid_struct (buf, sizeof (struct mtpos)))
-	return ERROR_NOACCESS;
-      if (!get_pos (mt))
-	((struct mtpos *) buf)->mt_blkno = block;
-    }
+    get_status (mt, (struct mtget *) buf);
+  else if (cmd == MTIOCPOS && !get_pos (mt))
+    ((struct mtpos *) buf)->mt_blkno = block;
 
   return lasterr;
 }
diff --git a/winsup/cygwin/gendef b/winsup/cygwin/gendef
index 84157287e..83e9e1245 100755
--- a/winsup/cygwin/gendef
+++ b/winsup/cygwin/gendef
@@ -271,8 +271,9 @@ EOF
 sub longjmp {
     return <<EOF;
 
-	.globl	_setjmp
+	.globl	_setjmp, ___sjfault
 _setjmp:
+___sjfault:
 	pushl	%ebp
 	movl	%esp,%ebp
 	pushl	%edi
diff --git a/winsup/cygwin/gentls_offsets b/winsup/cygwin/gentls_offsets
index 0d796f6af..322751849 100755
--- a/winsup/cygwin/gentls_offsets
+++ b/winsup/cygwin/gentls_offsets
@@ -41,7 +41,7 @@ print TMP <<EOF;
 #include <stdio.h>
 #include <stdlib.h>
 #include <signal.h>
-typedef void *HANDLE;
+#include <windows.h>
 $pre
 $def
 int
diff --git a/winsup/cygwin/libc/bsdlib.cc b/winsup/cygwin/libc/bsdlib.cc
index c25163e2e..48ccc4578 100644
--- a/winsup/cygwin/libc/bsdlib.cc
+++ b/winsup/cygwin/libc/bsdlib.cc
@@ -248,7 +248,8 @@ getprogname (void)
 extern "C" void
 setprogname (const char *newprogname)
 {
-  if (!check_null_str_errno (newprogname))
+  myfault efault;
+  if (!efault.faulted (EFAULT))
     {
       /* Per BSD man page, setprogname keeps a pointer to the last
 	 path component of the argument.  It does *not* copy the
diff --git a/winsup/cygwin/miscfuncs.cc b/winsup/cygwin/miscfuncs.cc
index 79ad5c312..531d2b1f2 100644
--- a/winsup/cygwin/miscfuncs.cc
+++ b/winsup/cygwin/miscfuncs.cc
@@ -19,6 +19,7 @@ details. */
 #include <winbase.h>
 #include <winnls.h>
 #include "cygthread.h"
+#include "cygtls.h"
 
 long tls_ix = -1;
 
@@ -146,76 +147,6 @@ strcasestr (const char *searchee, const char *lookfor)
 }
 
 int __stdcall
-check_null_str (const char *name)
-{
-  if (name && !IsBadStringPtr (name, CYG_MAX_PATH))
-    return 0;
-
-  return EFAULT;
-}
-
-int __stdcall
-check_null_empty_str (const char *name)
-{
-  if (name && !IsBadStringPtr (name, CYG_MAX_PATH))
-    return !*name ? ENOENT : 0;
-
-  return EFAULT;
-}
-
-int __stdcall
-check_null_empty_str_errno (const char *name)
-{
-  int __err;
-  if ((__err = check_null_empty_str (name)))
-    set_errno (__err);
-  return __err;
-}
-
-int __stdcall
-check_null_str_errno (const char *name)
-{
-  int __err;
-  if ((__err = check_null_str (name)))
-    set_errno (__err);
-  return __err;
-}
-
-int __stdcall
-__check_null_invalid_struct (void *s, unsigned sz)
-{
-  if (s && !IsBadWritePtr (s, sz))
-    return 0;
-
-  return EFAULT;
-}
-
-int __stdcall
-__check_null_invalid_struct_errno (void *s, unsigned sz)
-{
-  int err;
-  if ((err = __check_null_invalid_struct (s, sz)))
-    set_errno (err);
-  return err;
-}
-
-int __stdcall
-__check_invalid_read_ptr (const void *s, unsigned sz)
-{
-  if (s && !IsBadReadPtr (s, sz))
-    return 0;
-  return EFAULT;
-}
-
-int __stdcall
-__check_invalid_read_ptr_errno (const void *s, unsigned sz)
-{
-  if (s && !IsBadReadPtr (s, sz))
-    return 0;
-  return set_errno (EFAULT);
-}
-
-int __stdcall
 check_invalid_virtual_addr (const void *s, unsigned sz)
 {
   MEMORY_BASIC_INFORMATION mbuf;
@@ -228,43 +159,13 @@ check_invalid_virtual_addr (const void *s, unsigned sz)
   return 0;
 }
 
-ssize_t
-check_iovec_for_read (const struct iovec *iov, int iovcnt)
+static char __attribute__ ((noinline))
+dummytest (volatile char *p)
 {
-  if (iovcnt <= 0 || iovcnt > IOV_MAX)
-    {
-      set_errno (EINVAL);
-      return -1;
-    }
-
-  if (__check_invalid_read_ptr_errno (iov, iovcnt * sizeof (*iov)))
-    return -1;
-
-  size_t tot = 0;
-
-  while (iovcnt != 0)
-    {
-      if (iov->iov_len > SSIZE_MAX || (tot += iov->iov_len) > SSIZE_MAX)
-	{
-	  set_errno (EINVAL);
-	  return -1;
-	}
-
-      if (iov->iov_len
-	  && __check_null_invalid_struct_errno (iov->iov_base, iov->iov_len))
-	return -1;
-
-      iov += 1;
-      iovcnt -= 1;
-    }
-
-  assert (tot <= SSIZE_MAX);
-
-  return (ssize_t) tot;
+  return *p;
 }
-
 ssize_t
-check_iovec_for_write (const struct iovec *iov, int iovcnt)
+check_iovec (const struct iovec *iov, int iovcnt, bool forwrite)
 {
   if (iovcnt <= 0 || iovcnt > IOV_MAX)
     {
@@ -272,7 +173,8 @@ check_iovec_for_write (const struct iovec *iov, int iovcnt)
       return -1;
     }
 
-  if (__check_invalid_read_ptr_errno (iov, iovcnt * sizeof (*iov)))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return -1;
 
   size_t tot = 0;
@@ -285,12 +187,16 @@ check_iovec_for_write (const struct iovec *iov, int iovcnt)
 	  return -1;
 	}
 
-      if (iov->iov_len
-	  && __check_invalid_read_ptr_errno (iov->iov_base, iov->iov_len))
-	return -1;
+      volatile char *p = ((char *) iov->iov_base) + iov->iov_len - 1;
+      if (!iov->iov_len)
+	/* nothing to do */;
+      else if (!forwrite)
+	*p  = dummytest (p);
+      else
+	(void) dummytest (p);
 
-      iov += 1;
-      iovcnt -= 1;
+      iov++;
+      iovcnt--;
     }
 
   assert (tot <= SSIZE_MAX);
diff --git a/winsup/cygwin/msg.cc b/winsup/cygwin/msg.cc
index d226cc0c0..00d13a854 100644
--- a/winsup/cygwin/msg.cc
+++ b/winsup/cygwin/msg.cc
@@ -12,11 +12,11 @@ details. */
 #include "cygerrno.h"
 #include <signal.h>
 #ifdef USE_SERVER
-#include <sys/types.h>
 #include <stdio.h>
 #include <unistd.h>
 
 #include "sigproc.h"
+#include "cygtls.h"
 
 #include "cygserver_ipc.h"
 #include "cygserver_msg.h"
@@ -100,31 +100,20 @@ msgctl (int msqid, int cmd, struct msqid_ds *buf)
 #ifdef USE_SERVER
   syscall_printf ("msgctl (msqid = %d, cmd = 0x%x, buf = %p)",
 		  msqid, cmd, buf);
+  myfault efault;
+  if (efault.faulted (EFAULT))
+    return -1;
   switch (cmd)
     {
       case IPC_STAT:
-	if (__check_null_invalid_struct_errno (buf, sizeof *buf))
-	  return -1;
 	break;
       case IPC_SET:
-	if (__check_invalid_read_ptr_errno (buf, sizeof *buf))
-	  return -1;
 	break;
       case IPC_RMID:
 	break;
       case IPC_INFO:
-	/* msqid == 0: Request for msginfo struct. */
-	if (!msqid
-	    && __check_null_invalid_struct_errno (buf, sizeof (struct msginfo)))
-	    return -1;
-	/* Otherwise, request msqid entries from internal msqid_ds array. */
-	if (msqid)
-	  if (__check_null_invalid_struct_errno (buf, msqid * sizeof (struct msqid_ds)))
-	    return -1;
 	break;
       case MSG_INFO:
-	if (__check_null_invalid_struct_errno (buf, sizeof (struct msg_info)))
-	  return -1;
 	break;
       default:
 	syscall_printf ("-1 [%d] = msgctl ()", EINVAL);
@@ -177,7 +166,8 @@ msgrcv (int msqid, void *msgp, size_t msgsz, long msgtyp, int msgflg)
   syscall_printf ("msgrcv (msqid = %d, msgp = %p, msgsz = %d, "
 		  "msgtyp = %d, msgflg = 0x%x)",
 		  msqid, msgp, msgsz, msgtyp, msgflg);
-  if (__check_null_invalid_struct_errno (msgp, msgsz))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return -1;
   client_request_msg request (msqid, msgp, msgsz, msgtyp, msgflg);
   if (request.make_request () == -1 || request.rcvval () == -1)
@@ -202,7 +192,8 @@ msgsnd (int msqid, const void *msgp, size_t msgsz, int msgflg)
 #ifdef USE_SERVER
   syscall_printf ("msgsnd (msqid = %d, msgp = %p, msgsz = %d, msgflg = 0x%x)",
 		  msqid, msgp, msgsz, msgflg);
-  if (__check_invalid_read_ptr_errno (msgp, msgsz))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return -1;
   client_request_msg request (msqid, msgp, msgsz, msgflg);
   if (request.make_request () == -1 || request.retval () == -1)
diff --git a/winsup/cygwin/net.cc b/winsup/cygwin/net.cc
index 23989dd10..1fc54915c 100644
--- a/winsup/cygwin/net.cc
+++ b/winsup/cygwin/net.cc
@@ -134,7 +134,8 @@ cygwin_inet_ntoa (struct in_addr in)
 extern "C" unsigned long
 cygwin_inet_addr (const char *cp)
 {
-  if (check_null_str_errno (cp))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return INADDR_NONE;
   unsigned long res = inet_addr (cp);
 
@@ -147,7 +148,8 @@ cygwin_inet_addr (const char *cp)
 extern "C" int
 cygwin_inet_aton (const char *cp, struct in_addr *inp)
 {
-  if (check_null_str_errno (cp) || check_null_invalid_struct_errno (inp))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return 0;
 
   unsigned long res = inet_addr (cp);
@@ -165,7 +167,8 @@ extern "C" unsigned int WINAPI inet_network (const char *);
 extern "C" unsigned int
 cygwin_inet_network (const char *cp)
 {
-  if (check_null_str_errno (cp))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return INADDR_NONE;
   unsigned int res = inet_network (cp);
 
@@ -536,7 +539,8 @@ __dup_ent (unionent *&dst, unionent *src, struct_type type)
 extern "C" struct protoent *
 cygwin_getprotobyname (const char *p)
 {
-  if (check_null_str_errno (p))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return NULL;
   return (protoent *) dup_ent (protoent_buf, getprotobyname (p), t_protoent);
 }
@@ -625,9 +629,8 @@ cygwin_sendto (int fd, const void *buf, int len, int flags,
 
   fhandler_socket *fh = get (fd);
 
-  if ((len && __check_invalid_read_ptr_errno (buf, (unsigned) len))
-      || (to && __check_invalid_read_ptr_errno (to, tolen))
-      || !fh)
+  myfault efault;
+  if (efault.faulted (EFAULT) || !fh)
     res = -1;
   else if ((res = len) != 0)
     res = fh->sendto (buf, len, flags, to, tolen);
@@ -648,11 +651,8 @@ cygwin_recvfrom (int fd, void *buf, int len, int flags,
 
   fhandler_socket *fh = get (fd);
 
-  if ((len && __check_null_invalid_struct_errno (buf, (unsigned) len))
-      || (from
-	  && (check_null_invalid_struct_errno (fromlen)
-	      || __check_null_invalid_struct_errno (from, (unsigned) *fromlen)))
-      || !fh)
+  myfault efault;
+  if (efault.faulted (EFAULT) || !fh)
     res = -1;
   else if ((res = len) != 0)
     res = fh->recvfrom (buf, len, flags, from, fromlen);
@@ -707,7 +707,8 @@ cygwin_setsockopt (int fd, int level, int optname, const void *optval,
 	break;
     }
 
-  if ((optval && __check_invalid_read_ptr_errno (optval, optlen)) || !fh)
+  myfault efault;
+  if (efault.faulted (EFAULT) || !fh)
     res = -1;
   else
     {
@@ -771,10 +772,8 @@ cygwin_getsockopt (int fd, int level, int optname, void *optval, int *optlen)
 	name = "SO_PEERCRED";
     }
 
-  if ((optval
-       && (check_null_invalid_struct_errno (optlen)
-	   || __check_null_invalid_struct_errno (optval, (unsigned) *optlen)))
-      || !fh)
+  myfault efault;
+  if (efault.faulted (EFAULT) || !fh)
     res = -1;
   else if (optname == SO_PEERCRED)
     {
@@ -822,7 +821,8 @@ cygwin_connect (int fd, const struct sockaddr *name, int namelen)
 
   fhandler_socket *fh = get (fd);
 
-  if (__check_invalid_read_ptr_errno (name, namelen) || !fh)
+  myfault efault;
+  if (efault.faulted (EFAULT) || !fh)
     res = -1;
   else
     {
@@ -886,8 +886,8 @@ extern "C" struct servent *
 cygwin_getservbyname (const char *name, const char *proto)
 {
   sig_dispatch_pending ();
-  if (check_null_str_errno (name)
-      || (proto != NULL && check_null_str_errno (proto)))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return NULL;
 
   servent *res = (servent *) dup_ent (servent_buf, getservbyname (name, proto), t_servent);
@@ -900,7 +900,8 @@ extern "C" struct servent *
 cygwin_getservbyport (int port, const char *proto)
 {
   sig_dispatch_pending ();
-  if (proto != NULL && check_null_str_errno (proto))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return NULL;
 
   servent *res = (servent *) dup_ent (servent_buf, getservbyport (port, proto), t_servent);
@@ -912,7 +913,8 @@ extern "C" int
 cygwin_gethostname (char *name, size_t len)
 {
   sig_dispatch_pending ();
-  if (__check_null_invalid_struct_errno (name, len))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return -1;
 
   if (gethostname (name, len))
@@ -934,7 +936,8 @@ extern "C" struct hostent *
 cygwin_gethostbyname (const char *name)
 {
   sig_dispatch_pending ();
-  if (check_null_str_errno (name))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return NULL;
 
   unsigned char tmp_addr[4];
@@ -980,7 +983,8 @@ extern "C" struct hostent *
 cygwin_gethostbyaddr (const char *addr, int len, int type)
 {
   sig_dispatch_pending ();
-  if (__check_invalid_read_ptr_errno (addr, len))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return NULL;
 
   hostent *res = (hostent *) dup_ent (hostent_buf, gethostbyaddr (addr, len, type), t_hostent);
@@ -1000,9 +1004,8 @@ cygwin_accept (int fd, struct sockaddr *peer, int *len)
 
   fhandler_socket *fh = get (fd);
 
-  if ((peer && (check_null_invalid_struct_errno (len)
-		|| __check_null_invalid_struct_errno (peer, (unsigned) *len)))
-      || !fh)
+  myfault efault;
+  if (efault.faulted (EFAULT) || !fh)
     res = -1;
   else
     {
@@ -1031,7 +1034,8 @@ cygwin_bind (int fd, const struct sockaddr *my_addr, int addrlen)
   sig_dispatch_pending ();
   fhandler_socket *fh = get (fd);
 
-  if (__check_invalid_read_ptr_errno (my_addr, addrlen) || !fh)
+  myfault efault;
+  if (efault.faulted (EFAULT) || !fh)
     res = -1;
   else
     res = fh->bind (my_addr, addrlen);
@@ -1049,9 +1053,8 @@ cygwin_getsockname (int fd, struct sockaddr *addr, int *namelen)
 
   fhandler_socket *fh = get (fd);
 
-  if (check_null_invalid_struct_errno (namelen)
-      || __check_null_invalid_struct_errno (addr, (unsigned) *namelen)
-      || !fh)
+  myfault efault;
+  if (efault.faulted (EFAULT) || !fh)
     res = -1;
   else
     res = fh->getsockname (addr, namelen);
@@ -1112,7 +1115,8 @@ cygwin_hstrerror (int err)
 extern "C" void
 cygwin_herror (const char *s)
 {
-  if (s && check_null_str (s))
+  myfault efault;
+  if (efault.faulted ())
     return;
   if (cygheap->fdtab.not_open (2))
     return;
@@ -1151,9 +1155,8 @@ cygwin_getpeername (int fd, struct sockaddr *name, int *len)
 
   fhandler_socket *fh = get (fd);
 
-  if (check_null_invalid_struct_errno (len)
-      || __check_null_invalid_struct_errno (name, (unsigned) *len)
-      || !fh)
+  myfault efault;
+  if (efault.faulted (EFAULT) || !fh)
     res = -1;
   else
     res = fh->getpeername (name, len);
@@ -1188,7 +1191,8 @@ getdomainname (char *domain, size_t len)
    * Punt for now and assume MS-TCP on Win95.
    */
   sig_dispatch_pending ();
-  if (__check_null_invalid_struct_errno (domain, len))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return -1;
 
   PFIXED_INFO info = NULL;
@@ -1801,7 +1805,8 @@ get_ifconf (struct ifconf *ifc, int what)
   struct sockaddr_in *sa;
 
   sig_dispatch_pending ();
-  if (check_null_invalid_struct_errno (ifc))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return -1;
 
   /* Union maps buffer to correct struct */
@@ -1880,11 +1885,14 @@ cygwin_rcmd (char **ahost, unsigned short inport, char *locuser,
 
   sig_dispatch_pending ();
 
-  if (check_null_invalid_struct_errno (ahost) ||
-      check_null_empty_str_errno (*ahost) ||
-      (locuser && check_null_empty_str_errno (locuser)) ||
-      (remuser && check_null_str_errno (remuser)))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return (int) INVALID_SOCKET;
+  if (!*locuser)
+    {
+      set_errno (EINVAL);
+      return (int) INVALID_SOCKET;
+    }
 
   res = rcmd (ahost, inport, locuser, remuser, cmd, fd2p ? &fd2s : NULL);
   if (res != (int) INVALID_SOCKET)
@@ -1932,7 +1940,8 @@ cygwin_rresvport (int *port)
   int res;
   sig_dispatch_pending ();
 
-  if (check_null_invalid_struct_errno (port))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return -1;
 
   res = rresvport (port);
@@ -1960,10 +1969,8 @@ cygwin_rexec (char **ahost, unsigned short inport, char *locuser,
   SOCKET fd2s;
   sig_dispatch_pending ();
 
-  if (check_null_invalid_struct_errno (ahost) ||
-      check_null_empty_str_errno (*ahost) ||
-      (locuser && check_null_empty_str_errno (locuser)) ||
-      (password && check_null_str_errno (password)))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return (int) INVALID_SOCKET;
 
   res = rexec (ahost, inport, locuser, password, cmd, fd2p ? &fd2s : NULL);
@@ -2016,7 +2023,8 @@ socketpair (int family, int type, int protocol, int *sb)
   int len;
 
   sig_dispatch_pending ();
-  if (__check_null_invalid_struct_errno (sb, 2 * sizeof (int)))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return -1;
 
   if (family != AF_LOCAL && family != AF_INET)
@@ -2217,11 +2225,8 @@ cygwin_recvmsg (int fd, struct msghdr *msg, int flags)
 
   fhandler_socket *fh = get (fd);
 
-  if (check_null_invalid_struct_errno (msg)
-      || (msg->msg_name
-	  && __check_null_invalid_struct_errno (msg->msg_name,
-						(unsigned) msg->msg_namelen))
-      || !fh)
+  myfault efault;
+  if (efault.faulted (EFAULT) || !fh)
     res = -1;
   else
     {
@@ -2243,11 +2248,8 @@ cygwin_sendmsg (int fd, const struct msghdr *msg, int flags)
 
   fhandler_socket *fh = get (fd);
 
-  if (__check_invalid_read_ptr_errno (msg, sizeof msg)
-      || (msg->msg_name
-	  && __check_invalid_read_ptr_errno (msg->msg_name,
-					     (unsigned) msg->msg_namelen))
-      || !fh)
+  myfault efault;
+  if (efault.faulted (EFAULT) || !fh)
     res = -1;
   else
     {
@@ -2287,7 +2289,8 @@ cygwin_inet_ntop (int family, const void *addrptr, char *strptr, size_t len)
 {
   const u_char *p = (const u_char *) addrptr;
 
-  if (__check_null_invalid_struct_errno (strptr, len))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return NULL;
   if (family == AF_INET)
     {
diff --git a/winsup/cygwin/path.cc b/winsup/cygwin/path.cc
index ca955cb3a..2aeb1f198 100644
--- a/winsup/cygwin/path.cc
+++ b/winsup/cygwin/path.cc
@@ -542,6 +542,12 @@ path_conv::check (const char *src, unsigned opt,
     }
 #endif
 
+  myfault efault;
+  if (efault.faulted ())
+    {
+      error = EFAULT;
+      return;
+    }
   int loop = 0;
   path_flags = 0;
   known_suffix = NULL;
@@ -554,8 +560,12 @@ path_conv::check (const char *src, unsigned opt,
 
   if (!(opt & PC_NULLEMPTY))
     error = 0;
-  else if ((error = check_null_empty_str (src)))
-    return;
+  else if (!*src)
+    {
+      error = ENOENT;
+      return;
+    }
+
   /* This loop handles symlink expansion.  */
   for (;;)
     {
@@ -2473,8 +2483,11 @@ mount (const char *win32_path, const char *posix_path, unsigned flags)
 {
   int res = -1;
 
-  if (check_null_empty_str_errno (posix_path))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     /* errno set */;
+  else if (!*posix_path || !*win32_path)
+    set_errno (EINVAL);
   else if (strpbrk (posix_path, "\\:"))
     set_errno (EINVAL);
   else if (flags & MOUNT_CYGDRIVE) /* normal mount */
@@ -2485,7 +2498,7 @@ mount (const char *win32_path, const char *posix_path, unsigned flags)
       res = mount_table->write_cygdrive_info_to_registry (posix_path, flags);
       win32_path = NULL;
     }
-  else if (!check_null_empty_str_errno (win32_path))
+  else
     res = mount_table->add_item (win32_path, posix_path, flags, true);
 
   syscall_printf ("%d = mount (%s, %s, %p)", res, win32_path, posix_path, flags);
@@ -2500,8 +2513,14 @@ mount (const char *win32_path, const char *posix_path, unsigned flags)
 extern "C" int
 umount (const char *path)
 {
-  if (check_null_empty_str_errno (path))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return -1;
+  if (!*path)
+    {
+      set_errno (EINVAL);
+      return -1;
+    }
   return cygwin_umount (path, 0);
 }
 
@@ -2619,9 +2638,14 @@ symlink_worker (const char *topath, const char *frompath, bool use_winsym,
   /* POSIX says that empty 'frompath' is invalid input while empty
      'topath' is valid -- it's symlink resolver job to verify if
      symlink contents point to existing filesystem object */
-  if (check_null_empty_str_errno (topath) == EFAULT ||
-      check_null_empty_str_errno (frompath))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     goto done;
+  if (!*topath || !*frompath)
+    {
+      set_errno (EINVAL);
+      goto done;
+    }
 
   if (strlen (topath) >= CYG_MAX_PATH)
     {
@@ -3424,9 +3448,12 @@ char *
 getcwd (char *buf, size_t ulen)
 {
   char* res = NULL;
-  if (ulen == 0 && buf)
+  myfault efault;
+  if (efault.faulted (EFAULT))
+      /* errno set */;
+  else if (ulen == 0 && buf)
     set_errno (EINVAL);
-  else if (buf == NULL || !__check_null_invalid_struct_errno (buf, ulen))
+  else
     res = cygheap->cwd.get (buf, 1, 1, ulen);
   return res;
 }
@@ -3442,8 +3469,14 @@ getwd (char *buf)
 extern "C" int
 chdir (const char *in_dir)
 {
-  if (check_null_empty_str_errno (in_dir))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return -1;
+  if (!*in_dir)
+    {
+      set_errno (ENOENT);
+      return -1;
+    }
 
   syscall_printf ("dir '%s'", in_dir);
 
@@ -3566,16 +3599,28 @@ cygwin_conv_to_full_win32_path (const char *path, char *win32_path)
 extern "C" int
 cygwin_conv_to_posix_path (const char *path, char *posix_path)
 {
-  if (check_null_empty_str_errno (path))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return -1;
+  if (!*path)
+    {
+      set_errno (ENOENT);
+      return -1;
+    }
   return_with_errno (mount_table->conv_to_posix_path (path, posix_path, 1));
 }
 
 extern "C" int
 cygwin_conv_to_full_posix_path (const char *path, char *posix_path)
 {
-  if (check_null_empty_str_errno (path))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return -1;
+  if (!*path)
+    {
+      set_errno (ENOENT);
+      return -1;
+    }
   return_with_errno (mount_table->conv_to_posix_path (path, posix_path, 0));
 }
 
diff --git a/winsup/cygwin/pthread.cc b/winsup/cygwin/pthread.cc
index deb771682..d35cee616 100644
--- a/winsup/cygwin/pthread.cc
+++ b/winsup/cygwin/pthread.cc
@@ -15,6 +15,7 @@
 #include "cygerrno.h"
 #include <stdarg.h>
 #include <sys/fcntl.h>
+#include "cygtls.h"
 
 extern "C"
 {
@@ -165,8 +166,14 @@ sem_destroy (sem_t * sem)
 static bool
 mangle_sem_name (char *mangled, const char *name)
 {
-  if (check_null_empty_str_errno (name))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return false;
+  if (!*name)
+    {
+      set_errno (ENOENT);
+      return false;
+    }
   int len = strlen (name);
   if (len >= CYG_MAX_PATH
       || (wincap.has_terminal_services () && len >= CYG_MAX_PATH - 7))
diff --git a/winsup/cygwin/resource.cc b/winsup/cygwin/resource.cc
index 536dfe8a5..9112bbe77 100644
--- a/winsup/cygwin/resource.cc
+++ b/winsup/cygwin/resource.cc
@@ -18,6 +18,7 @@ details. */
 #include "cygerrno.h"
 #include "pinfo.h"
 #include "psapi.h"
+#include "cygtls.h"
 
 /* add timeval values */
 static void
@@ -113,7 +114,8 @@ getrlimit (int resource, struct rlimit *rlp)
 {
   MEMORY_BASIC_INFORMATION m;
 
-  if (check_null_invalid_struct_errno (rlp))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return -1;
 
   rlp->rlim_cur = RLIM_INFINITY;
@@ -157,7 +159,8 @@ getrlimit (int resource, struct rlimit *rlp)
 extern "C" int
 setrlimit (int resource, const struct rlimit *rlp)
 {
-  if (__check_invalid_read_ptr_errno (rlp, sizeof (*rlp)))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return -1;
 
   struct rlimit oldlimits;
diff --git a/winsup/cygwin/sec_helper.cc b/winsup/cygwin/sec_helper.cc
index 5bfa9d4cd..20ef794a3 100644
--- a/winsup/cygwin/sec_helper.cc
+++ b/winsup/cygwin/sec_helper.cc
@@ -16,7 +16,6 @@ details. */
 #include <unistd.h>
 #include <stdlib.h>
 #include <limits.h>
-#include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/acl.h>
 #include <ctype.h>
diff --git a/winsup/cygwin/select.cc b/winsup/cygwin/select.cc
index 1acf80eb2..13913c95f 100644
--- a/winsup/cygwin/select.cc
+++ b/winsup/cygwin/select.cc
@@ -166,19 +166,16 @@ pselect(int maxfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
   struct timeval tv;
   sigset_t oldset = myself->getsigmask ();
 
+  myfault efault;
+  if (efault.faulted (EFAULT))
+    return -1;
   if (ts)
     {
-      if (check_invalid_read_struct_errno (ts))
-	return -1;
       tv.tv_sec = ts->tv_sec;
       tv.tv_usec = ts->tv_nsec / 1000;
     }
   if (set)
-    {
-      if (check_invalid_read_struct_errno (set))
-	return -1;
-      set_signal_mask (*set);
-    }
+    set_signal_mask (*set);
   int ret = cygwin_select (maxfds, readfds, writefds, exceptfds,
 			   ts ? &tv : NULL);
   if (set)
diff --git a/winsup/cygwin/sem.cc b/winsup/cygwin/sem.cc
index 1d7f53c67..ea617f664 100644
--- a/winsup/cygwin/sem.cc
+++ b/winsup/cygwin/sem.cc
@@ -21,6 +21,7 @@ details. */
 
 #include "cygserver_ipc.h"
 #include "cygserver_sem.h"
+#include "cygtls.h"
 
 /*
  * client_request_sem Constructors
@@ -93,22 +94,8 @@ semctl (int semid, int semnum, int cmd, ...)
     }
   syscall_printf ("semctl (semid = %d, semnum = %d, cmd = %d, arg.val = 0x%x)",
 		  semid, semnum, cmd, arg.val);
-  if ((cmd == IPC_STAT || cmd == IPC_SET)
-      && __check_null_invalid_struct_errno (arg.buf, sizeof (struct semid_ds)))
-    return -1;
-  if (cmd == IPC_INFO)
-    {
-      /* semid == 0: Request for seminfo struct. */
-      if (!semid
-	  && __check_null_invalid_struct_errno (arg.buf, sizeof (struct seminfo)))
-	  return -1;
-      /* Otherwise, request semid entries from internal semid_ds array. */
-      if (semid)
-	if (__check_null_invalid_struct_errno (arg.buf, semid * sizeof (struct semid_ds)))
-	  return -1;
-    }
-  if (cmd == SEM_INFO
-      && __check_null_invalid_struct_errno (arg.buf, sizeof (struct sem_info)))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return -1;
   client_request_sem request (semid, semnum, cmd, &arg);
   if (request.make_request () == -1 || request.retval () == -1)
@@ -156,7 +143,8 @@ semop (int semid, struct sembuf *sops, size_t nsops)
 #ifdef USE_SERVER
   syscall_printf ("semop (semid = %d, sops = %p, nsops = %d)",
 		  semid, sops, nsops);
-  if (__check_null_invalid_struct_errno (sops, nsops * sizeof (struct sembuf)))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return -1;
   client_request_sem request (semid, sops, nsops);
   if (request.make_request () == -1 || request.retval () == -1)
diff --git a/winsup/cygwin/shm.cc b/winsup/cygwin/shm.cc
index 89846914a..f6cc30baf 100644
--- a/winsup/cygwin/shm.cc
+++ b/winsup/cygwin/shm.cc
@@ -22,6 +22,7 @@ details. */
 
 #include "cygserver_ipc.h"
 #include "cygserver_shm.h"
+#include "cygtls.h"
 
 /*
  * client_request_shm Constructors
@@ -244,28 +245,9 @@ shmctl (int shmid, int cmd, struct shmid_ds *buf)
 #ifdef USE_SERVER
   syscall_printf ("shmctl (shmid = %d, cmd = %d, buf = 0x%x)",
 		  shmid, cmd, buf);
-  switch (cmd)
-    {
-      case IPC_STAT:
-      case IPC_SET:
-	if (__check_null_invalid_struct_errno (buf, sizeof (struct shmid_ds)))
-	  return -1;
-	break;
-      case IPC_INFO:
-	/* shmid == 0: Request for shminfo struct. */
-	if (!shmid
-	    && __check_null_invalid_struct_errno (buf, sizeof (struct shminfo)))
-	    return -1;
-	/* Otherwise, request shmid entries from internal shmid_ds array. */
-	if (shmid)
-	  if (__check_null_invalid_struct_errno (buf, shmid * sizeof (struct shmid_ds)))
-	    return -1;
-	break;
-      case SHM_INFO:
-	if (__check_null_invalid_struct_errno (buf, sizeof (struct shm_info)))
-	  return -1;
-	break;
-    }
+  myfault efault;
+  if (efault.faulted (EFAULT))
+    return -1;
   client_request_shm request (shmid, cmd, buf);
   if (request.make_request () == -1 || request.retval () == -1)
     {
diff --git a/winsup/cygwin/signal.cc b/winsup/cygwin/signal.cc
index 935083ce1..b3a0e31c1 100644
--- a/winsup/cygwin/signal.cc
+++ b/winsup/cygwin/signal.cc
@@ -147,17 +147,15 @@ handle_sigprocmask (int how, const sigset_t *set, sigset_t *oldset, sigset_t& op
       return -1;
     }
 
+  myfault efault;
+  if (efault.faulted (EFAULT))
+    return -1;
+
   if (oldset)
-    {
-      if (check_null_invalid_struct_errno (oldset))
-	return -1;
-      *oldset = opmask;
-    }
+    *oldset = opmask;
 
   if (set)
     {
-      if (check_invalid_read_struct_errno (set))
-	return -1;
       sigset_t newmask = opmask;
       switch (how)
 	{
diff --git a/winsup/cygwin/syscalls.cc b/winsup/cygwin/syscalls.cc
index 3f50a7b99..804965f36 100644
--- a/winsup/cygwin/syscalls.cc
+++ b/winsup/cygwin/syscalls.cc
@@ -550,7 +550,12 @@ open (const char *unix_path, int flags, ...)
   sig_dispatch_pending ();
 
   syscall_printf ("open (%s, %p)", unix_path, flags);
-  if (!check_null_empty_str_errno (unix_path))
+  myfault efault;
+  if (efault.faulted (EFAULT))
+    /* errno already set */;
+  else if (!*unix_path)
+    set_errno (ENOENT);
+  else
     {
       /* check for optional mode argument */
       va_start (ap, flags);
@@ -1008,7 +1013,8 @@ stat_worker (const char *name, struct __stat64 *buf, int nofollow)
   int res = -1;
   fhandler_base *fh = NULL;
 
-  if (check_null_invalid_struct_errno (buf))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     goto error;
 
   if (!(fh = build_fh_name (name, NULL, nofollow ? PC_SYM_NOFOLLOW : PC_SYM_FOLLOW,
@@ -1299,13 +1305,14 @@ system (const char *cmdstring)
 {
   pthread_testcancel ();
 
-  if (check_null_empty_str_errno (cmdstring))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return -1;
 
   int res;
   const char* command[4];
 
-  if (cmdstring == (const char *) NULL)
+  if (cmdstring == NULL)
     return 1;
 
   command[0] = "sh";
@@ -1437,11 +1444,17 @@ fpathconf (int fd, int v)
 extern "C" long int
 pathconf (const char *file, int v)
 {
+  myfault efault;
+  if (efault.faulted (EFAULT))
+    return -1;
+  if (!*file)
+    {
+      set_errno (ENOENT);
+      return -1;
+    }
   switch (v)
     {
     case _PC_PATH_MAX:
-      if (check_null_empty_str_errno (file))
-	  return -1;
       return PATH_MAX - strlen (file);
     case _PC_NAME_MAX:
       return PATH_MAX;
@@ -1483,8 +1496,9 @@ extern "C" int
 ttyname_r (int fd, char *buf, size_t buflen)
 {
   int ret = 0;
-  if (__check_null_invalid_struct (buf, buflen))
-    ret = EINVAL;
+  myfault efault;
+  if (efault.faulted ())
+    ret = EFAULT;
   else
     {
       cygheap_fdget cfd (fd, true);
@@ -1713,9 +1727,14 @@ statvfs (const char *fname, struct statvfs *sfs)
   int ret = -1;
   char root[CYG_MAX_PATH];
 
-  if (check_null_empty_str_errno (fname)
-      || check_null_invalid_struct_errno (sfs))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return -1;
+  if (!*fname)
+    {
+      set_errno (ENOENT);
+      return -1;
+    }
 
   syscall_printf ("statfs %s", fname);
 
@@ -1798,7 +1817,8 @@ fstatvfs (int fd, struct statvfs *sfs)
 extern "C" int
 statfs (const char *fname, struct statfs *sfs)
 {
-  if (check_null_invalid_struct_errno (sfs))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return -1;
   struct statvfs vfs;
   int ret = statvfs (fname, &vfs);
@@ -1837,33 +1857,27 @@ setpgid (pid_t pid, pid_t pgid)
     pgid = pid;
 
   if (pgid < 0)
-    {
-      set_errno (EINVAL);
-      goto out;
-    }
+    set_errno (EINVAL);
   else
     {
       pinfo p (pid, PID_MAP_RW);
       if (!p)
-	{
-	  set_errno (ESRCH);
-	  goto out;
-	}
+	set_errno (ESRCH);
+      else if (p->pgid == pgid)
+	res = 0;
       /* A process may only change the process group of itself and its children */
-      if (p == myself || p->ppid == myself->pid)
+      else if (p != myself && p->ppid != myself->pid)
+	set_errno (EPERM);
+      else
 	{
 	  p->pgid = pgid;
 	  if (p->pid != p->pgid)
 	    p->set_has_pgid_children (0);
 	  res = 0;
-	}
-      else
-	{
-	  set_errno (EPERM);
-	  goto out;
+	  // init_console_handler (FALSE);
 	}
     }
-out:
+
   syscall_printf ("pid %d, pgid %d, res %d", pid, pgid, res);
   return res;
 }
@@ -1924,8 +1938,14 @@ mknod_worker (const char *path, mode_t type, mode_t mode, _major_t major,
 extern "C" int
 mknod32 (const char *path, mode_t mode, __dev32_t dev)
 {
-  if (check_null_empty_str_errno (path))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return -1;
+  if (!*path)
+    {
+      set_errno (ENOENT);
+      return -1;
+    }
 
   if (strlen (path) >= CYG_MAX_PATH)
     return -1;
@@ -2627,7 +2647,8 @@ endutent ()
 extern "C" void
 utmpname (const char *file)
 {
-  if (check_null_empty_str (file))
+  myfault efault;
+  if (efault.faulted () || !*file)
     {
       debug_printf ("Invalid file");
       return;
@@ -2678,7 +2699,8 @@ getutent ()
 extern "C" struct utmp *
 getutid (struct utmp *id)
 {
-  if (check_null_invalid_struct_errno (id))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return NULL;
   if (utmp_fd < 0)
     {
@@ -2716,7 +2738,8 @@ getutid (struct utmp *id)
 extern "C" struct utmp *
 getutline (struct utmp *line)
 {
-  if (check_null_invalid_struct_errno (line))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return NULL;
   if (utmp_fd < 0)
     {
@@ -2738,7 +2761,8 @@ getutline (struct utmp *line)
 extern "C" struct utmp *
 pututline (struct utmp *ut)
 {
-  if (check_null_invalid_struct (ut))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return NULL;
   internal_setutent (true);
   if (utmp_fd < 0)
@@ -2786,7 +2810,8 @@ getutxid (const struct utmpx *id)
 {
   static struct utmpx utx;
 
-  if (__check_invalid_read_ptr (id, sizeof *id))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return NULL;
   ((struct utmpx *)id)->ut_time = id->ut_tv.tv_sec;
   return copy_ut_to_utx (getutid ((struct utmp *) id), &utx);
@@ -2797,7 +2822,8 @@ getutxline (const struct utmpx *line)
 {
   static struct utmpx utx;
 
-  if (__check_invalid_read_ptr (line, sizeof *line))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return NULL;
   ((struct utmpx *)line)->ut_time = line->ut_tv.tv_sec;
   return copy_ut_to_utx (getutline ((struct utmp *) line), &utx);
@@ -2808,7 +2834,8 @@ pututxline (const struct utmpx *utmpx)
 {
   static struct utmpx utx;
 
-  if (__check_invalid_read_ptr (utmpx, sizeof *utmpx))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return NULL;
   ((struct utmpx *)utmpx)->ut_time = utmpx->ut_tv.tv_sec;
   return copy_ut_to_utx (pututline ((struct utmp *) utmpx), &utx);
diff --git a/winsup/cygwin/thread.cc b/winsup/cygwin/thread.cc
index c0a55dc31..2d5d273df 100644
--- a/winsup/cygwin/thread.cc
+++ b/winsup/cygwin/thread.cc
@@ -1771,7 +1771,8 @@ semaphore::_timedwait (const struct timespec *abstime)
   struct timeval tv;
   long waitlength;
 
-  if (__check_invalid_read_ptr (abstime, sizeof *abstime))
+  myfault efault;
+  if (efault.faulted ())
     {
       /* According to SUSv3, abstime need not be checked for validity,
 	 if the semaphore can be locked immediately. */
@@ -3233,9 +3234,8 @@ semaphore::post (sem_t *sem)
 int
 semaphore::getvalue (sem_t *sem, int *sval)
 {
-
-  if (!is_good_object (sem)
-      || __check_null_invalid_struct (sval, sizeof (int)))
+  myfault efault;
+  if (efault.faulted () || !is_good_object (sem))
     {
       set_errno (EINVAL);
       return -1;
diff --git a/winsup/cygwin/thread.h b/winsup/cygwin/thread.h
index 5f7b39845..9c1f8eed7 100644
--- a/winsup/cygwin/thread.h
+++ b/winsup/cygwin/thread.h
@@ -11,8 +11,8 @@ This software is a copyrighted work licensed under the terms of the
 Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
 details. */
 
-#ifndef _CYGNUS_THREADS_
-#define _CYGNUS_THREADS_
+#ifndef _THREAD_H
+#define _THREAD_H
 
 #define LOCK_MMAP_LIST   1
 
@@ -707,4 +707,4 @@ struct MTinterface
 };
 
 #define MT_INTERFACE user_data->threadinterface
-#endif // _CYGNUS_THREADS_
+#endif // _THREAD_H
diff --git a/winsup/cygwin/timer.cc b/winsup/cygwin/timer.cc
index 0714eb160..b6f1b4cdd 100644
--- a/winsup/cygwin/timer.cc
+++ b/winsup/cygwin/timer.cc
@@ -216,10 +216,10 @@ timer_tracker::settime (int in_flags, const itimerspec *value, itimerspec *ovalu
       return -1;
     }
 
-  if (__check_invalid_read_ptr_errno (value, sizeof (*value))
+  myfault efault;
+  if (efault.faulted (EFAULT)
       || it_bad (value->it_value)
-      || it_bad (value->it_interval)
-      || (ovalue && check_null_invalid_struct_errno (ovalue)))
+      || it_bad (value->it_interval))
     return -1;
 
   long long now = in_flags & TIMER_ABSTIME ? 0 : gtod.usecs (false);
@@ -271,11 +271,12 @@ timer_tracker::gettime (itimerspec *ovalue)
 extern "C" int
 timer_gettime (timer_t timerid, struct itimerspec *ovalue)
 {
-  if (check_null_invalid_struct_errno (ovalue))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return -1;
 
   timer_tracker *tt = (timer_tracker *) timerid;
-  if (check_null_invalid_struct (tt) || tt->magic != TT_MAGIC)
+  if (tt->magic != TT_MAGIC)
     {
       set_errno (EINVAL);
       return -1;
@@ -288,8 +289,8 @@ timer_gettime (timer_t timerid, struct itimerspec *ovalue)
 extern "C" int
 timer_create (clockid_t clock_id, struct sigevent *evp, timer_t *timerid)
 {
-  if (evp && check_null_invalid_struct_errno (evp)
-      || check_null_invalid_struct_errno (timerid))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return -1;
   if (clock_id != CLOCK_REALTIME)
     {
@@ -306,7 +307,10 @@ timer_settime (timer_t timerid, int flags, const struct itimerspec *value,
 	       struct itimerspec *ovalue)
 {
   timer_tracker *tt = (timer_tracker *) timerid;
-  if (check_null_invalid_struct (tt) || tt->magic != TT_MAGIC)
+  myfault efault;
+  if (efault.faulted (EFAULT))
+    return -1;
+  if (tt->magic != TT_MAGIC)
     {
       set_errno (EINVAL);
       return -1;
@@ -319,7 +323,10 @@ extern "C" int
 timer_delete (timer_t timerid)
 {
   timer_tracker *in_tt = (timer_tracker *) timerid;
-  if (check_null_invalid_struct (in_tt) || in_tt->magic != TT_MAGIC)
+  myfault efault;
+  if (efault.faulted (EFAULT))
+    return -1;
+  if (in_tt->magic != TT_MAGIC)
     {
       set_errno (EINVAL);
       return -1;
@@ -386,7 +393,8 @@ getitimer (int which, struct itimerval *ovalue)
       set_errno (EINVAL);
       return -1;
     }
-  if (check_null_invalid_struct_errno (ovalue))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return -1;
   struct itimerspec spec_ovalue;
   int ret = timer_gettime ((timer_t) &ttstart, &spec_ovalue);
diff --git a/winsup/cygwin/times.cc b/winsup/cygwin/times.cc
index 708f48df6..aca27c6a5 100644
--- a/winsup/cygwin/times.cc
+++ b/winsup/cygwin/times.cc
@@ -53,7 +53,8 @@ times (struct tms *buf)
 {
   FILETIME creation_time, exit_time, kernel_time, user_time;
 
-  if (check_null_invalid_struct_errno (buf))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return ((clock_t) -1);
 
   DWORD ticks = GetTickCount ();
diff --git a/winsup/cygwin/tlsoffsets.h b/winsup/cygwin/tlsoffsets.h
index bda6bd173..448f24f8f 100644
--- a/winsup/cygwin/tlsoffsets.h
+++ b/winsup/cygwin/tlsoffsets.h
@@ -1,117 +1,125 @@
 //;# autogenerated:  Do not edit.
 
-//; $tls::sizeof__cygtls = 3972;
-//; $tls::func = -3972;
+//; $tls::sizeof__cygtls = 3980;
+//; $tls::func = -3980;
 //; $tls::pfunc = 0;
-//; $tls::saved_errno = -3968;
+//; $tls::saved_errno = -3976;
 //; $tls::psaved_errno = 4;
-//; $tls::sa_flags = -3964;
+//; $tls::sa_flags = -3972;
 //; $tls::psa_flags = 8;
-//; $tls::oldmask = -3960;
+//; $tls::oldmask = -3968;
 //; $tls::poldmask = 12;
-//; $tls::deltamask = -3956;
+//; $tls::deltamask = -3964;
 //; $tls::pdeltamask = 16;
-//; $tls::event = -3952;
+//; $tls::event = -3960;
 //; $tls::pevent = 20;
-//; $tls::errno_addr = -3948;
+//; $tls::errno_addr = -3956;
 //; $tls::perrno_addr = 24;
-//; $tls::initialized = -3944;
+//; $tls::initialized = -3952;
 //; $tls::pinitialized = 28;
-//; $tls::sigmask = -3940;
+//; $tls::sigmask = -3948;
 //; $tls::psigmask = 32;
-//; $tls::sigwait_mask = -3936;
+//; $tls::sigwait_mask = -3944;
 //; $tls::psigwait_mask = 36;
-//; $tls::sigwait_info = -3932;
+//; $tls::sigwait_info = -3940;
 //; $tls::psigwait_info = 40;
-//; $tls::threadkill = -3928;
+//; $tls::threadkill = -3936;
 //; $tls::pthreadkill = 44;
-//; $tls::infodata = -3924;
+//; $tls::infodata = -3932;
 //; $tls::pinfodata = 48;
-//; $tls::tid = -3776;
+//; $tls::tid = -3784;
 //; $tls::ptid = 196;
-//; $tls::local_clib = -3772;
+//; $tls::local_clib = -3780;
 //; $tls::plocal_clib = 200;
-//; $tls::__dontuse = -3772;
+//; $tls::__dontuse = -3780;
 //; $tls::p__dontuse = 200;
-//; $tls::locals = -2708;
+//; $tls::locals = -2716;
 //; $tls::plocals = 1264;
-//; $tls::_ctinfo = -1084;
+//; $tls::_ctinfo = -1092;
 //; $tls::p_ctinfo = 2888;
+//; $tls::_myfault = -1088;
+//; $tls::p_myfault = 2892;
+//; $tls::_myfault_errno = -1084;
+//; $tls::p_myfault_errno = 2896;
 //; $tls::wq = -1080;
-//; $tls::pwq = 2892;
+//; $tls::pwq = 2900;
 //; $tls::prev = -1052;
-//; $tls::pprev = 2920;
+//; $tls::pprev = 2928;
 //; $tls::next = -1048;
-//; $tls::pnext = 2924;
+//; $tls::pnext = 2932;
 //; $tls::stackptr = -1044;
-//; $tls::pstackptr = 2928;
+//; $tls::pstackptr = 2936;
 //; $tls::sig = -1040;
-//; $tls::psig = 2932;
+//; $tls::psig = 2940;
 //; $tls::incyg = -1036;
-//; $tls::pincyg = 2936;
+//; $tls::pincyg = 2944;
 //; $tls::spinning = -1032;
-//; $tls::pspinning = 2940;
+//; $tls::pspinning = 2948;
 //; $tls::stacklock = -1028;
-//; $tls::pstacklock = 2944;
+//; $tls::pstacklock = 2952;
 //; $tls::stack = -1024;
-//; $tls::pstack = 2948;
+//; $tls::pstack = 2956;
 //; $tls::padding = 0;
-//; $tls::ppadding = 3972;
+//; $tls::ppadding = 3980;
 //; __DATA__
 
-#define tls_func (-3972)
+#define tls_func (-3980)
 #define tls_pfunc (0)
-#define tls_saved_errno (-3968)
+#define tls_saved_errno (-3976)
 #define tls_psaved_errno (4)
-#define tls_sa_flags (-3964)
+#define tls_sa_flags (-3972)
 #define tls_psa_flags (8)
-#define tls_oldmask (-3960)
+#define tls_oldmask (-3968)
 #define tls_poldmask (12)
-#define tls_deltamask (-3956)
+#define tls_deltamask (-3964)
 #define tls_pdeltamask (16)
-#define tls_event (-3952)
+#define tls_event (-3960)
 #define tls_pevent (20)
-#define tls_errno_addr (-3948)
+#define tls_errno_addr (-3956)
 #define tls_perrno_addr (24)
-#define tls_initialized (-3944)
+#define tls_initialized (-3952)
 #define tls_pinitialized (28)
-#define tls_sigmask (-3940)
+#define tls_sigmask (-3948)
 #define tls_psigmask (32)
-#define tls_sigwait_mask (-3936)
+#define tls_sigwait_mask (-3944)
 #define tls_psigwait_mask (36)
-#define tls_sigwait_info (-3932)
+#define tls_sigwait_info (-3940)
 #define tls_psigwait_info (40)
-#define tls_threadkill (-3928)
+#define tls_threadkill (-3936)
 #define tls_pthreadkill (44)
-#define tls_infodata (-3924)
+#define tls_infodata (-3932)
 #define tls_pinfodata (48)
-#define tls_tid (-3776)
+#define tls_tid (-3784)
 #define tls_ptid (196)
-#define tls_local_clib (-3772)
+#define tls_local_clib (-3780)
 #define tls_plocal_clib (200)
-#define tls___dontuse (-3772)
+#define tls___dontuse (-3780)
 #define tls_p__dontuse (200)
-#define tls_locals (-2708)
+#define tls_locals (-2716)
 #define tls_plocals (1264)
-#define tls__ctinfo (-1084)
+#define tls__ctinfo (-1092)
 #define tls_p_ctinfo (2888)
+#define tls__myfault (-1088)
+#define tls_p_myfault (2892)
+#define tls__myfault_errno (-1084)
+#define tls_p_myfault_errno (2896)
 #define tls_wq (-1080)
-#define tls_pwq (2892)
+#define tls_pwq (2900)
 #define tls_prev (-1052)
-#define tls_pprev (2920)
+#define tls_pprev (2928)
 #define tls_next (-1048)
-#define tls_pnext (2924)
+#define tls_pnext (2932)
 #define tls_stackptr (-1044)
-#define tls_pstackptr (2928)
+#define tls_pstackptr (2936)
 #define tls_sig (-1040)
-#define tls_psig (2932)
+#define tls_psig (2940)
 #define tls_incyg (-1036)
-#define tls_pincyg (2936)
+#define tls_pincyg (2944)
 #define tls_spinning (-1032)
-#define tls_pspinning (2940)
+#define tls_pspinning (2948)
 #define tls_stacklock (-1028)
-#define tls_pstacklock (2944)
+#define tls_pstacklock (2952)
 #define tls_stack (-1024)
-#define tls_pstack (2948)
+#define tls_pstack (2956)
 #define tls_padding (0)
-#define tls_ppadding (3972)
+#define tls_ppadding (3980)
diff --git a/winsup/cygwin/uinfo.cc b/winsup/cygwin/uinfo.cc
index d63f93d3d..0e0da14e5 100644
--- a/winsup/cygwin/uinfo.cc
+++ b/winsup/cygwin/uinfo.cc
@@ -169,9 +169,9 @@ getlogin_r (char *name, size_t namesize)
   size_t len = strlen (login) + 1;
   if (len > namesize)
     return ERANGE;
-  int err = __check_null_invalid_struct (name, len);
-  if (err)
-    return err;
+  myfault efault;
+  if (efault.faulted ())
+    return EFAULT;
   strncpy (name, login, len);
   return 0;
 }
diff --git a/winsup/cygwin/uname.cc b/winsup/cygwin/uname.cc
index daad40922..35cf75804 100644
--- a/winsup/cygwin/uname.cc
+++ b/winsup/cygwin/uname.cc
@@ -14,6 +14,7 @@ details. */
 #include <stdio.h>
 #include <sys/utsname.h>
 #include "cygwin_version.h"
+#include "cygtls.h"
 
 /* uname: POSIX 4.4.1.1 */
 extern "C" int
@@ -21,7 +22,8 @@ uname (struct utsname *name)
 {
   SYSTEM_INFO sysinfo;
 
-  if (check_null_invalid_struct_errno (name))
+  myfault efault;
+  if (efault.faulted (EFAULT))
     return -1;
 
   char *snp = strstr  (cygwin_version.dll_build_date, "SNP");
diff --git a/winsup/cygwin/winsup.h b/winsup/cygwin/winsup.h
index fc9e9ec22..374e5052f 100644
--- a/winsup/cygwin/winsup.h
+++ b/winsup/cygwin/winsup.h
@@ -266,26 +266,11 @@ void __stdcall set_console_title (char *);
 void init_console_handler (BOOL);
 void init_global_security ();
 
-int __stdcall check_null_str (const char *name) __attribute__ ((regparm(1)));
-int __stdcall check_null_empty_str (const char *name) __attribute__ ((regparm(1)));
-int __stdcall check_null_empty_str_errno (const char *name) __attribute__ ((regparm(1)));
-int __stdcall check_null_str_errno (const char *name) __attribute__ ((regparm(1)));
-int __stdcall __check_null_invalid_struct (void *s, unsigned sz) __attribute__ ((regparm(2)));
-int __stdcall __check_null_invalid_struct_errno (void *s, unsigned sz) __attribute__ ((regparm(2)));
-int __stdcall __check_invalid_read_ptr (const void *s, unsigned sz) __attribute__ ((regparm(2)));
-int __stdcall __check_invalid_read_ptr_errno (const void *s, unsigned sz) __attribute__ ((regparm(2)));
 int __stdcall check_invalid_virtual_addr (const void *s, unsigned sz) __attribute__ ((regparm(2)));
 
-#define check_null_invalid_struct(s) \
-  __check_null_invalid_struct ((s), sizeof (*(s)))
-#define check_null_invalid_struct_errno(s) \
-  __check_null_invalid_struct_errno ((s), sizeof (*(s)))
-#define check_invalid_read_struct_errno(s) \
-  __check_invalid_read_ptr_errno ((s), sizeof (*(s)))
-
-struct iovec;
-ssize_t check_iovec_for_read (const struct iovec *, int) __attribute__ ((regparm(2)));
-ssize_t check_iovec_for_write (const struct iovec *, int) __attribute__ ((regparm(2)));
+ssize_t check_iovec (const struct iovec *, int, bool) __attribute__ ((regparm(3)));
+#define check_iovec_for_read(a, b) check_iovec ((a), (b), false)
+#define check_iovec_for_write(a, b) check_iovec ((a), (b), true)
 
 #define set_winsock_errno() __set_winsock_errno (__FUNCTION__, __LINE__)
 void __set_winsock_errno (const char *fn, int ln) __attribute__ ((regparm(2)));